Abstract
Purpose
To evaluate the value of preoperative intravoxel incoherent motion diffusion-weighted imaging (IVIM-DWI) and conventional MRI indicators in identifying sarcomatoid dedifferentiation in renal cell carcinoma (RCC) and tumor thrombus.
Methods
From September 2016 to April 2023, consecutive patients with RCC and tumor thrombus who received routine MRI examination and IVIM-DWI before radical resection were enrolled prospectively. Kaplan–Meier method with log-rank test was used to calculate and compare the survival probability. The preoperative imaging features were analyzed. Univariate and multivariable logistic regression analyses were employed to identify independent predictors of sarcomatoid dedifferentiation. The predictive ability was evaluated by receiver operating characteristic (ROC) curves.
Results
Twenty-two patients (15.3%) of the 144 patients in the training set (median age, 58.0 years [IQR, 52.0–65.0 years]; 108 men) and 11 patients (22.4%) of the 49 patients in the test set (median age, 58.0 years [IQR, 53.0–63.0 years]; 38 men) had sarcomatoid dedifferentiated tumors. Patients with sarcomatoid-differentiated tumors had poor progress-free survival in the training set and test set (P < 0.001 and P = 0.007). f value (P = 0.011), mN stage (P = 0.007), and necrosis (P = 0.041) were independent predictors for predicting sarcomatoid dedifferentiation in the training set. The model combining conventional MRI features and f value had AUCs of 0.832 (95% CI 0.755–0.909) and 0.825 (95% CI 0.702–0.948) in predicting sarcomatoid dedifferentiation in the training set and test set.
Conclusion
It is feasible to preoperatively identify sarcomatoid dedifferentiation based on IVIM-DWI and conventional MR imaging indicators.
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Data availability
The data sets generated during and/or analyzed during the current study are available from the corresponding author upon reasonable request.
Abbreviations
- RCC:
-
Renal cell carcinoma
- OS:
-
Overall survival
- IVIM-DWI:
-
Intravoxel incoherent motion diffusion-weighted imaging
- IQR:
-
Interquartile range
- CMP:
-
Corticomedullary phase
- NP:
-
Nephrographic phase
- NEX:
-
Number of excitations
- T2LIA:
-
T2 low-intensity areas
- ADC:
-
Apparent diffusion coefficient
- ROI:
-
Regions of interest
- BMI:
-
Body mass index
- ISUP:
-
International Society of Urological Pathology
- PFS:
-
Progression-free survival
- SD:
-
Standard deviation
- ICC:
-
Intraclass correlation coefficient
- ROC:
-
Receiver operating characteristic
- AUC:
-
Area under the ROC curve
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Acknowledgements
We acknowledge the patients whose samples/data provided the foundation for this study, and are grateful to the multidisciplinary team of urology in Chinese PLA General Hospital for their support and assistance.
Funding
This work was supported by the National Natural Science Foundation of China (Grant No. 81971580, 82271951) and Beijing Natural Science Foundation (7222167).
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Zhao, J., Ding, X., Zhou, S. et al. Renal cell carcinoma and venous tumor thrombus: predicting sarcomatoid dedifferentiation through preoperative IVIM-based MR imaging. Abdom Radiol (2024). https://doi.org/10.1007/s00261-024-04210-1
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DOI: https://doi.org/10.1007/s00261-024-04210-1